catalytic core domain of RNA-dependent RNA polymerase (RdRp) in the genus Luteovirus of positive-sense single-stranded RNA [(+)ssRNA] viruses
This group contains the catalytic core domain of the RdRp of RNA viruses belonging to the Luteovirus genus within the family Tombusviridae, order Tolivirales. There are 13 species in the Luteovirus genus: Apple associated luteovirus, Apple luteovirus 1, Barley yellow dwarf virus kerII, Barley yellow dwarf virus kerIII, Barley yellow dwarf virus MAV, Barley yellow dwarf virus PAS, Barley yellow dwarf virus PAV, Bean leafroll virus, Cherry associated luteovirus, Nectarine stem pitting associated virus, Red clover associated luteovirus, Rose spring dwarf-associated virus, and Soybean dwarf virus. Plants serve as natural hosts. The geographical distribution of Luteoviruses is widespread, with the virus primarily infecting plants via transmission by aphid vectors. The virus only replicates within the host cell and not within the vector. The name 'luteovirus' is derived from the Latin luteus (yellow) due to the symptomatic yellowing of the plant that occurs as a result of infection. The RdRp domain displays a right hand with three functional subdomains, called fingers, palm, and thumb. All RdRps contain conserved polymerase motifs (A-G), located in the palm (A-E motifs) and finger (F-G) subdomains. All these motifs have been implicated in RdRp fidelity such as processes of correct incorporation and reorganization of nucleotides.
Jiyao W et al.(2023). "The conserved domain database in 2023.",